Answers needed for a, b, and c. Thank you!

Stocks A and B have the following historical returns: Year Stock A's Returns Stock B's Returns 2015 (24.25%) 5.50% 2016 18.50 26.73 2017 38.67 48.25 2018 14.33 (4.50) 2019 39.13 43.86 Assume the risk-free rate during this time was 3.5%. What are the Sharpe ratios for Stocks A and B and the portfolio over this time period using their average returns? Answers: a) Sharpe ratio for Stock A 0.5332 0.8839 b) Sharpe ratio for Stock B c) Sharpe ratio for Portfolio AB Note: enter your answers with 4 decimal places